Hair-spring stud for watches.



PATENTED MAY 16, 1905.

, anmwhoz '1], W /5p*0/z J. W. GIBSON.

HAIR SPRING STUD POE WATCHES.

APPLICATION FILED DBO 27 1904 Clfkomumg UNITED STATES Patented May 16,1905.

PATENT @FFICE.

HAIR-SPRING STUD FOR WATCHES.

SPECIFICATION forming part of Letters l-atent No. 789,851, dated May 16,1905. Application filed December 27.1904. Serial No. 238,448.

To to whom it may concern.-

Be it known that I, JOHN TILLIAMSON GinsoN, a citizen of the UnitedStates, residing at Mystic, in the county of Appanoosa and State ofIowa, have invented certain new and useful Improvements in Hair-SpringStuds; and 1 do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to improvements in hair-spring studs for watchesand clocks.

The object of the invention is to provide a hair-spring stud by whichthe end of the spring may be securely held and which may be quickly andeasily loosened to permit the adjusting of the spring without removingthe balancecock or the balance-wheel bridge or disturbing any otherparts of the works.

With the above and other objects in view the invention consists ofcertain novel features of construction, combination, and arrangement ofparts, as will be hereinafterdescribed and claimed.

In the accompanying drawings, Figure 1 is a plan view of a balance-cockor balance-wheel bridge-plate, showing the application of the invention.Fig. 2 is a vertical sectional view ofthe same, and Fig. 3 is ahorizontal sectional View through the stud and the holdingplug forsecuring the end of the spring. Fig. 4 is a detail perspective view ofthe stud, and Fig. 5 is a similar view of the plug removed from thestud.

Referring more particularly to the drawings, 1 denotes the balance-cockor balancewheel bridge of a watch to which is secured my improvedhair-spring stud 2, with which is adjustably connected the end of ahairspring 3. The stud 2 may be attached to the balance-cock orbridge-plate 1 in any suitable manner, but is here shown as connected byproviding said plate with a rectangular opening, in which is secured thesquared upper end 4 of the stud.

The stud 4 preferably consists of a tubular cylindrical body portion inthe lower end and at one side of which is formed two alined rectangularopenings or slots 5, through which I is adapted to be inserted the endof the spring 3. To hold said end of the spring in place in said slots5, a plug 6 is arranged within said tubular stud, said plug beingpreferably threaded and in the form of a screw, which is adapted to bescrewed into engagement with threads formed in the inner walls of thetubular stud, thereby securing said plug in the stud. The lower end ofthe plug is recessed or cut away at one side, as shown at 7, so thatwhen the plug is turned in one direction after being screwed into thestud the surface of the same will be engaged with and will bind againstthe end of the spring within the stud, thus fastening the same in place.To release the spring, the plug is turned in the opposite direction,thus bringing the recess? opposite the spring, which will permit thesame to be taken up or to be disengaged from the stud. By constructingthe stud in this manner it is simply necessary to turn the plug to aslight degree to release the spring and permit the same to be taken upor adjusted, after which a slight turn of the plug in the oppositedirection will again secure the end of the spring, the arrangement ofthe stud being such that the locking plug may be turned by ascrew-driver or other suitable tool without removing the balance-cock orbridge-plate or disturbing any of the works of the watch or injuring thespring in any manner.

From the foregoing description, taken in connection with theaccompanying drawings, the construction and operation of the inventionwill be readily understood without requiring a more extendedexplanation.

Various changes in the form, proportion, and the minor details ofconstruction may be resorted to without departing from the principle orsacrificing any of the advantages of this invention.

Having thus described my invention, what 1 claim as new, and desire tosecure by Letters Patent, is-

A hollow interiorly-threaded hair-spring stud adapted to be secured. inthe balance-cock or balance-wheel bridge of a watch, said stud havingformed therein transverse, oppositely- [Q be brought opposite the end ofthe spring thereby releasing the same, substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

JOHN WILLIAMSON GIBSON.

Witnesses:

J. E. Score T. F. HIGGINBOTHAM.

